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NotesEconomics HLTopic 4.4Monetary union
Back to Economics HL Topics
4.4.35 min read

Monetary union (Economics HL)

IB Economics · Unit 4

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Contents

  1. 1What a monetary union is
  2. 2Compared with a common market
  3. 3Advantages and disadvantages
  4. 4Exam-style question

Monetary union is the deepest step of integration: one currency and one central bank.

A monetary union, step by step

1

A common market

Free trade, a common external tariff, free movement of labour and capital.

First
2

One currency

Members give up their own money: the euro is used in 20 EU countries.

Plus
3

One central bank

The European Central Bank sets one interest rate for all of them.

Plus

The points to remember

  • Define it like this: "A monetary union is a group of countries that share a common currency and a common central bank."
  • The euro area is the main example.

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A monetary union is a common market plus a shared currency.

Common market

  • Free trade and a common external tariff.
  • Labour and capital move freely.
  • Each country keeps its own currency and interest rate.

Monetary union

  • Everything in a common market.
  • One currency for all members.
  • One central bank and one interest rate.

The points to remember

  • Members lose their own interest rate and exchange rate.
  • Distinguish: say what both share, then what the union adds.

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At Higher Level, weigh the gains against what members give up.

Advantages

  • No cost of changing money, no exchange-rate risk: more trade and investment.
  • Prices are easy to compare across borders: more competition.
  • A strong, trusted central bank can keep inflation low.

Disadvantages

  • No own interest rate or exchange rate to fight a recession.
  • Limits on government borrowing restrict fiscal policy.
  • Greece, in the 2010s, could not devalue to recover its exports.

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Paper 1 asked this in November 2024 and November 2025, as part (b) for 15 marks.

IB-style questionDiscuss[15 marks]

Using real-world examples, discuss the advantages and disadvantages for a country of joining a monetary union.

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How the 15 marks are given

MarksWhat your answer needs
13–15Theory fully explained, terms right all the way through, balanced evaluation, real examples fully developed to support the argument
10–12Theory explained, terms mostly right, evaluation mostly balanced, real examples developed
7–9Theory partly explained, some evaluation but one-sided, examples partly developed
4–6Theory only described, evaluation superficial, examples only named
1–3Theory stated but not relevant, no evaluation

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one disadvantage of joining a monetary union. [1 mark]

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4.1.1Benefits of international trade4.1.2Free trade on a diagram: exports and imports4.1.3Absolute and comparative advantage (HL)4.1.4Limitations of comparative advantage (HL)
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